The “good neighbor” or “interstate transport” provisions of the federal Clean Air Act protect downwind states from harmful pollution that originates in upwind states. This State Implementation Plan (SIP) revision contains Washington’s analysis of the interstate transport of sulfur dioxide (SO2) and ozone (O3). Our analysis suggests that Washington’s sources do not significantly contribute to SO2 or O3 air pollution in other states, affecting nonattainment or impeding maintenance areas. No new rules are proposed.

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The mission of the Department of Ecology is to protect, preserve, and enhance Washington’s environment. To help us meet that goal, please consider the environment before you print or request a copy.

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